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Western Indian Ocean SST signal and anomalous Antarctic sea-ice concentration variation

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Abstract

Teleconnection between El Nino/La Nina-Southern Oscillation (ENSO) phenomenon and anomalous Antarctic sea-ice variation has been studied extensively. In this study, impacts of sea surface temperature in the Indian Ocean on Antarctic sea-ice change were investigated during Janaury 1979 and October 2009. Based on previous research results, sea areas in the western Indian Ocean (WIO; 50°-70°E, 10°-20°S) are selected for the resreach. All variables showed 1–10 year interannual timescales by Fast Founer Tranaform (FFT) transformation. Results show that i) strong WIO signals emerged in the anomalous changes of Antarctic sea-ice concentration; ii) significant positive correlations occurred around the Antarctic Peninsula, Ross Sea and its northwest peripheral sea region iii) negative correlation occurred in the Indian Ocean section of the Southern Ocean, Amundsen Seas, and the sea area over northern Ross Sea; and iv) the atmospheric anomalies associated with the WIO including wind, meridional heat flux, and surface air temperature over southern high latitudes were the possible factors for the teleconnection.

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Correspondence to Na Liu.

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Foundation item: The National Basic Research Program of China (973 Program) under contract No. 2010CB950301, the National Nature Science Foundation of China (40706015), Special Fund Basic Research and Operating Expenses under contract No. 2010T01, National Key Technology R&D Program of China under contract No.2011BAC03B02.

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Liu, N., Zhang, Z., Chen, H. et al. Western Indian Ocean SST signal and anomalous Antarctic sea-ice concentration variation. Acta Oceanol. Sin. 30, 9–13 (2011). https://doi.org/10.1007/s13131-011-0100-0

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